Turn a ruby array into a neat column string?

I'm new to ruby, and I'm trying to make a program that automates formatting for given strings and arrays. One autoformat function I'm trying to figure out is one for arrays. So let's say I have an array like the example below

myArray = ["a", "b", "c"]

and I want to turn it into a columnized string so that

puts myString

will give

`1) a`
`2) b`
`3) c`

How would I go about doing this? The closest thing I can find is using

.each

which isn't what I want, I can't have each line a separate entry. It all has to be one string with line breaks.